There is no "volume in and out" on the back of this unit. I am not sure what you are refering to. There IS an FX level control switch on the back which is used IF you are using EXTERNAL effects units. This switch is used to set the level to MATCH that required of the EXTERNAL device. If you are NOT using external effect unit, this switch is not used. It will not be active unless you plug into the external FX jacks.
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There is no "volume in and out" on the back of this unit. I am not sure what you are refering to. There IS an FX level control switch on the back which is used IF you are using EXTERNAL effects units. This switch is used to set the level to MATCH that required of the EXTERNAL device. If you are NOT using external effect unit, this switch is not used. It will not be active unless you plug into the external FX jacks.